Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2002.08a
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- Pages.783-786
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- 2002
Unsteady Flow and Noise Characteristics of a Wing in Ground Effect at Close Proximity
근접 지면효과를 받는 날개의 비정상 유동 소음 특성
Abstract
The unsteady turbulent flow characteristics of NACA4406 airfoil at close proximity to the pound are numerically investigated, especially focused on the noise generation mechanism near the blunt trailing edge. The unsteady two-dimensional compressible Wavier-Stokes equations with a Spalart-Allmaras turbulence closure model are solved by the 6th-order compact scheme and the 4th-order Runge-Kutta scheme. The computation shows a noise generation by a feedback mechanism at the blunt tailing edge, where the acoustic-fluidic coupling occurs between the wall-reflected sound waves and the periodically disturbed turbulent shear layer.